Nail file including inner and outer helical springs

Abstract

A nail file formed by providing an inner helical spring and an outer helical spring in a cover set; wherein, the outer helical spring is slipped over the inner helical spring to form an elastic inner filing member with an elastic toothed surface of multiple layers and bent to form a shape of an arciform new moon. The cover set is made of elastoplastics and includes an upper cover and a lower cover both in the shape of an arciform new moon. A user can press the cover set and the elastic inner filing member therein for elastic stretching and retracting the gaps in the elastic toothed surface of the elastic inner filing member, and can adjust the spaces of the gaps by screwing or unscrewing of a screw to suit filing of nails of various thickness at the positions of the outer and inner sharp edges to get rid of rough edges on the nails. Thereby efficiency, convenience and smoothness of nail filing can be largely increased.

What I claim as new and desire to be secured by Letters Patent of the United States are:  
     
       1. A nail file comprising an elastic inner filing member formed by slipping an inner helical spring in an outer helical spring, said elastic inner filing member is bent to form a shape of an arciform new moon, said elastic inner filing member thus is characterized by having an elastic toothed surface of multiple layers thereon. 
     
     
       2. A nail file as in claim  1 , wherein, said elastic inner filing member is clamped between an upper cover and a lower cover both made in the shape of an arciform new moon, said upper cover and lower cover are provided together with a concave side, a convex side and two convex ends on the two ends of both to reveal said elastic toothed surface. 
     
     
       3. A nail file as in claim  2 , wherein, said upper cover and lower cover are made of elastomer including elastoplastics or elastic rubber. 
     
     
       4. A nail file as in claim  2 , wherein, said upper cover and lower cover are provided thereon with a screw to lock said upper cover and lower cover on said elastic inner filing member, and said screw is used to adjust gaps on said elastic toothed surface to suit filing of nails of various thickness. 
     
     
       5. A nail file as in claim  2 , wherein, said two convex ends on said two ends of both said upper and lower covers are adapted for elastic pressing to control spaces of said gaps on said elastic toothed surface formed between said convex and concave sides, and to control stretching and retracting of said elastic toothed surface in meeting the shape of arciform new moon of an end surface of said nail by grinding and trimming.